well, they were chemists as we see it today, but back then alchemy was a magician's trade if I'm not mistaken, either way, what the card does doesn't require a mage keyword. In fact I wouldn't give it any keyword at all. It already has 3 possible effects and one negative. usually cards that also have negative effects don't have a keyword, and that I think adds a bit to their unsteady nature.
and I agree with Progressor. Perhaps it would be better to just comment and allow the creator to change the card, unless you can find a way to make the text shorter maybe, or more functional?